During The Labyrinth of Time's ending sequence, the ScummVM application cannot be returned to the launcher menu or closed, even by trying to close the window. Attempting to load a save file also does not work, though this is unusual behavior.
Save file attached for the Windows version. Use the talisman from the inventory on the keystone to trigger the ending sequence.
Tested in ScummVM 1.9.0git8-g83b3d67 (Feb 7 2016, 15:02:00), Win32
(Relatedly, the whole application closes after the ending screen. I've never completed a game in ScummVM, so I'm not clear if this is expected behavior or if it should return to the launcher menu. If closing is normal, ignore this paragraph!)
Fixed.